Yes

you do need a jacket based on the weather in Zaragoza, Spain 1 second ago

Why? Because it's not very warm out.
53°F11°C & Cloudy

Wind is 6 mph10 km/h from the E, gusting to 12 mph20 km/h
April 27
12am53°F11°C6 mph10 km/h ECloudy
1am52°F11°C7 mph12 km/h SECloudy
2am53°F12°C9 mph14 km/h SECloudy
3am55°F13°C10 mph15 km/h SEMostly Cloudy
4am58°F15°C10 mph15 km/h SEMostly Cloudy
5am61°F16°C10 mph16 km/h SCloudy
6am64°F18°C10 mph16 km/h SMostly Cloudy
7am66°F19°C10 mph17 km/h SWDrizzle
8am68°F20°C11 mph18 km/h SWMostly Cloudy
9am69°F21°C12 mph19 km/h SWMostly Cloudy
10am70°F21°C13 mph20 km/h SWPartly Cloudy
11am72°F22°C13 mph21 km/h SWPartly Cloudy
DateLowHighWindDayNight
April 2652°F11°C73°F23°C11 mph17 km/h from SDrizzleMostly Clear
April 2746°F8°C69°F21°C4 mph7 km/h from NPartly CloudyDrizzle
April 2848°F9°C65°F19°C8 mph13 km/h from NWDrizzleMostly Cloudy
April 2948°F9°C72°F22°C6 mph10 km/h from WPartly CloudyMostly Cloudy
April 3054°F12°C65°F18°C9 mph15 km/h from WPartly CloudyMostly Clear
May 147°F8°C69°F21°C9 mph15 km/h from WMostly ClearPartly Cloudy
May 250°F10°C82°F28°C8 mph13 km/h from WPartly CloudyMostly Cloudy

Yes

Low of 46°F8°C, High of 70°F21°C
Wind: 4 mph7 km/h
Precipitation: 22% rain

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